RDMA/cxgb4: Do CIDX_INC updates every 1/16 CQ depth CQE reaps

This avoids the CIDX_INC overflow issue with T4A2 when running
kernel RDMA applications.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h
index 70004425d695..24af12fc8228 100644
--- a/drivers/infiniband/hw/cxgb4/t4.h
+++ b/drivers/infiniband/hw/cxgb4/t4.h
@@ -507,8 +507,14 @@ static inline void t4_swcq_consume(struct t4_cq *cq)
 static inline void t4_hwcq_consume(struct t4_cq *cq)
 {
         cq->bits_type_ts = cq->queue[cq->cidx].bits_type_ts;
-        if (++cq->cidx_inc == cq->size)
+        if (++cq->cidx_inc == (cq->size >> 4)) {
+                u32 val;
+
+                val = SEINTARM(0) | CIDXINC(cq->cidx_inc) | TIMERREG(7) |
+                      INGRESSQID(cq->cqid);
+                writel(val, cq->gts);
                 cq->cidx_inc = 0;
+        }
         if (++cq->cidx == cq->size) {
                 cq->cidx = 0;
                 cq->gen ^= 1;